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Fatigue life of Bolt

  1. Aug 12, 2008 #1
    Hi All,

    We have manufactured a custom bolt (similar to standard bolt).
    Now we need to calculate the fatigue life of the bolt.
    Could you please guide me in calculating the fatigue life?


  2. jcsd
  3. Aug 12, 2008 #2


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    What type of loading?

  4. Aug 12, 2008 #3


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    Gold Member

    Basically, you'll need to know what the loading conditions are, what material the bolt is made out of, and the stress concentrations in the bolt. As long as you used a well-known material, you should be able to find an S-n diagram for it; but it will be up to you to figure out where the bolt will fail and under what conditions.
  5. Aug 12, 2008 #4


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    There are standards for doing such tests. I would suggest a look through ASTM's specs.

    It will also drastically depend on material, heat treat and what you have made custom in the design.
  6. Aug 13, 2008 #5
    Thank you.

    I need to do Hand calculation.
    The axial load on the bolt is around 2000 pounds.
    The shank dia of the bolt is .1250".


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